<template>
  <button @click="modalOpen = true">
    弹出一个全屏模态窗口</button>

  <teleport to="body">
    <div v-if="modalOpen" class="modal">
      <div>
        这是一个模态窗口!
        我的父元素是"body"！
        <button @click="modalOpen = false">Close</button>
      </div>
    </div>
  </teleport>
</template>

<script>
export default {
  data() {
    return {
      modalOpen: false
    }
  },
};
</script>

<style scoped>
.modal {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background-color: rgba(0,0,0,.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.modal div {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: white;
  width: 300px;
  height: 300px;
  padding: 5px;
}
</style>